1122720 has 48 divisors (see below), whose sum is σ = 3538080. Its totient is φ = 299264.

The previous prime is 1122701. The next prime is 1122721. The reversal of 1122720 is 272211.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1122720.

It is not an unprimeable number, because it can be changed into a prime (1122721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 690 + ... + 1649.

It is an arithmetic number, because the mean of its divisors is an integer number (73710).

2^1122720 is an apocalyptic number.

1122720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1122720 is an abundant number, since it is smaller than the sum of its proper divisors (2415360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1122720 is a wasteful number, since it uses less digits than its factorization.

1122720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357 (or 2349 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 1122720 is about 1059.5848243534. The cubic root of 1122720 is about 103.9338830250.

Adding to 1122720 its reverse (272211), we get a palindrome (1394931).

The spelling of 1122720 in words is "one million, one hundred twenty-two thousand, seven hundred twenty".